计算:5a²-[a²+(5a²-2a)-2(a²-3a)]
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计算:5a²-[a²+(5a²-2a)-2(a²-3a)]
![计算:5a²-[a²+(5a²-2a)-2(a²-3a)]](/uploads/image/z/2359488-48-8.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A5a%26%23178%3B-%5Ba%26%23178%3B%2B%EF%BC%885a%26%23178%3B-2a%EF%BC%89-2%EF%BC%88a%26%23178%3B-3a%EF%BC%89%5D)
原式=5a^2-(a^2+5a^2-2a-2a^2+6a)
=5a^2-a^2-5a^2+2a+2a^2-6a
=(5-1-5+2)a^2+(2-6)a
=a^2-4a
=5a^2-a^2-5a^2+2a+2a^2-6a
=(5-1-5+2)a^2+(2-6)a
=a^2-4a
计算:5a²-[a²+(5a²-2a)-2(a²-3a)]
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